Samsung SPH-M520ZSAQST - Manual (Page 56)

30 Section 2A: Phone Basics
3. Orient the microSD’s contact gold contact pins downward (see
illustration on previous page).
4. Carefully insert the microSD card into the opening and firmly push it
in until you hear a click that indicates the card is securely installed.
5. With the card now securely installed, replace the plastic cover over
the microSD slot on the phone.
Note: To remove the card, firmly push the end of the card further into the
phone and release—the card should pop out from the memory card
slot. If this does not work, repeat this process again.